1.在res/values下创建attrs.xml
<declare-styleable name="MyRadioButton"> <attr name="str" format="string"/> </declare-styleable>
MyRadioButton为组件名字,随意起,attr标签定义组件的属性,name对应的是属性名,format是属性的类型,具体可参见《[Android]attrs.xml文件中属性类型format值的格式》。
public class MyRadioButton extends RadioButton { private String url; public MyRadioButton(Context context,AttributeSet attrs) { super(context,attrs); TypedArray taArray = context.obtainStyledAttributes(attrs,R.styleable.MyRadioButton); this.url = taArray.getString(R.styleable.MyRadioButton_str); taArray.recycle(); } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } }
a. TypedArray是存放资源R.styleable.MyRadioButton指定的属性集合。
b. 通过getXXX()获取属性值。
c. recycle()结束绑定
3.在布局文件中使用
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:demo="http://schemas.android.com/apk/res/net.csdn.blog.wxg630815" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <RadioGroup android:layout_width="fill_parent" android:layout_height="wrap_content" > <net.csdn.blog.wxg630815.MyRadioButton android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/myradio1" demo:str="1.csdn.net" /> <net.csdn.blog.wxg630815.MyRadioButton android:layout_width="fill_parent" android:layout_height="wrap_parent" android:id="@+id/myradio2" demo:str="2.csdn.net" /> </RadioGroup> </LinearLayout>